This is one of the worst apps I have ever purchased from Apple. I am shocked that Apple allows this Developer to be here. First, I downloaded the basic app to see if I liked it, and quickly discovered that the overwhelming onslaught of adds prevented me from using it sufficiently to decide if I liked it. However, I have not found another app that would allow me to measure the strength of my WiFi signal in each room of my house, as this one claims to do, so I decided to take a chance and buy the PRO version { $8.99 } which seemed expensive so I hoped it actually worked as claimed.To my surprise, buying the PRO version DID NOT make any difference. It DID NOT STOP OR EVEN REDUCE the number of ads. The continued overwhelming onslaught of ads makes it impossible to use this app. In my case, just trying to buy the App was frustrating. Each time I tried to click on the upgrade button another ad would pop up, effectively cancelling my action. When I finally succeeded in reaching the purchase page, after entering my password and clicking on Buy, the pop-up symbol spun, and almost simultaneously another pop-up said the purchase failed as another ad started. There are a lot of apps that measure WiFi speed, but few if any measure signal strength, which is actually just as important. So, I was excited when I first found this app, but I now know it is effectively useless.